> For the complete documentation index, see [llms.txt](https://use.temporal.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://use.temporal.xyz/nozomi/transaction-submission-api-v2.md).

# API v2

A faster alternative to JSON-RPC that eliminates JSON parsing overhead and CORS preflight latency. Recommended for browser clients and performance-sensitive backends.

## Request

| Field        | Value                                    |
| ------------ | ---------------------------------------- |
| Method       | `POST`                                   |
| Path         | `/api/sendTransaction2?c=<YOUR_API_KEY>` |
| Content-Type | `text/plain`                             |
| Body         | Base64-encoded transaction bytes         |

## Response

Returns an empty body with `200 OK` on success. **Does not return a transaction signature** — track signatures client-side before submitting.

## Why Use API v2

| Advantage         | Detail                                          |
| ----------------- | ----------------------------------------------- |
| No CORS preflight | Saves 50–100ms per request from browser clients |
| Faster encoding   | Base64 is faster to encode/decode than base58   |
| Smaller payload   | No JSON wrapper, plain text body                |
| Lower overhead    | No JSON parsing on the server side              |

## When to Use

Use API v2 when you don't need the transaction signature returned in the response, and want the lowest possible submission latency. Ideal for browser-based applications and high-frequency backends.

If you need a transaction signature in the response, use [JSON-RPC](/nozomi/transaction-submission-json-rpc.md) instead.


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